Where to pay the entry fee to UK ? How to pay ?

Where should I pay the entry fee to UK ?

When entering the country ? At the airport ? Before I travel ?

Is there anything else required or I just provide my ID, then pay the fee and everything is allright ?

To pay the entry fee, you have to apply and pay online before you travel.

Please note that you cannot enter the UK until your application is processed.

Applications should be processed within 3 working days, but sometimes it can take longer. I recommend to apply and pay at least a week before you travel.